script.test.js

const googleSearch = require('./script');

dbMock = ['dog.com', 'cheesepuff.com', 'disney.com', 'dogpictures.com'];

describe('googleSearch', () => {
    it('is a silly test', () => {
        expect('hello').toBe('hello');
    });

    it('is searching google', () => {
        expect(googleSearch('testtest', dbMock)).toEqual([]);
        expect(googleSearch('dog', dbMock)).toEqual([
            'dog.com',
            'dogpictures.com'
        ]);
    });

    it('work with undefined and null input', () => {
        expect(googleSearch(undefined, dbMock)).toEqual([]);
        expect(googleSearch(null, dbMock)).toEqual([]);
    });

    it('does not return more than 3 matches', () => {
        expect(googleSearch('.com', dbMock).length).toEqual(3);
    }); 
});